package thread;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;

public class AttemptLocking {
    private ReentrantLock lock = new ReentrantLock();

    public void untimed(){
        boolean captured = lock.tryLock();
        try{
            System.out.println("tryLock(): "+captured);
        }finally {
            if (captured)
                lock.unlock();
        }
    }

    public void timed(){
        boolean captured = false;
        try{
            captured = lock.tryLock(2,TimeUnit.SECONDS);
        }catch (InterruptedException ex){
            throw new RuntimeException(ex);
        }

        try{
            System.out.println("tryLock(2,TimeUnit.SECONDS)" + captured);
        }finally {
            if (captured)
                lock.unlock();
        }
    }

    public static void main(String[] args) {
        final AttemptLocking al = new AttemptLocking();
        al.untimed();
        al.timed();
        new Thread(){
            {setDaemon(true);}

            @Override
            public void run() {
                al.lock.lock();
                System.out.println("acquired");
            }
        }.start();
        Thread.yield();
        al.untimed();
        al.timed();
    }
}
